已知复数z的实部为﹣1，虚部为2，则z（i+1）=（ ）．
i﹣3
Britain announced tighter security measures this week, with plans ______ full-body scanners at Heathrow airport within three weeks.
A．to use
B．to be using
C．being used
D．having used
PM800显示的电能读数是以什么作单位的？
